Using the keyboard to page through the page HTMLUIControl contents

[Andy Foster]

Hi,

Is it possible to use the keyboard to page up and down through a page using the HTMLUIControl?

I know that it ispossible to use the mouse to scroll through, but so far I hav been unable to find a way to achieve this through the keyboard. Sorry if I've missed something obvious.

Andy

[Jagadeesan Pichaimuthu]

Hi Andy, 

 

Thanks for using Syncfusion product. 

 

We have checked your requirement, but currently the HTMLUI control not have support for the page up and page down keys. You can refer the following documentation for the supported key operations in this control, 

 

UG Link: https://help.syncfusion.com/windowsforms/htmlui/keyboard 

 

But you can able to achieve your requirement by customizing the KeyUp event of the control. In HTMLUI control provides support to scroll by using the ScrollToElement(which scrolls to the particular element) and ScrollToRectangle(which is used to scroll to specific location). By using these methods you can able to perform the page up and page down operations, please refer the below code snippet and sample. 

 

this.htmluiControl1.KeyUp += HtmluiControl1_KeyUp; 

 

private void HtmluiControl1_KeyUp(object sender, KeyEventArgs e) 

{ 

    if(e.KeyData == Keys.PageDown) 

    { 

        this.ScrollToEnd(); 

    } 

    else if(e.KeyData == Keys.PageUp) 

    { 

        this.ScrollToTop(); 

    }             

} 

 

 

private void ScrollToTop() 

{ 

    IHTMLElement elem = this.htmluiControl1.Document.RenderRoot; 

    this.htmluiControl1.ScrollToElement(this.htmluiControl1.Document.RenderRoot); 

} 

 

private void ScrollToEnd() 

{ 

    IHTMLElement elem = this.htmluiControl1.Document.RenderRoot; 

    Point lastPoint = new Point(0, (elem.Location.Y + elem.Size.Height)); 

    Rectangle rect = new Rectangle(new Point(10, lastPoint.Y - 10), new Size(10, 10)); 

    this.htmluiControl1.ScrollToRectangle(rect, this.htmluiControl1.Document); 

} 

 

Sample: http://www.syncfusion.com/downloads/support/forum/145180/ze/HtmlUI_Sample1030250628  

 

You can refer the below UG document for your reference. 

https://help.syncfusion.com/windowsforms/htmlui/scrolling  

 

Let us know whether this helps also if you need any further assistance on this. 

 

Regards, 

Jagadeesan 

[Andy Foster]

Thank you. With your suggestions and a couple of API calls I have been able to achieve page and line scrolling.

Appreciate your help.

Andy

[Jagadeesan Pichaimuthu]

Hi Andy, 

 

Thanks for your update. 

 

We are glad to know that the provided solution worked at your end. Please let us know if you have any further queries on this. We are happy to help you. 

 

Regards, 

Jagadeesan